June 1999
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PRO LACEME 747
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Speed
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CA3228
Control System with Memory
Features
• Low Power Dissipation
• I
2
L Control Logic
• Power-On Reset
• On-Chip Oscillator for System Time Reference
• Single Input Line for Operator Commands
• Amplitude Encoded Control Signals
• Transient Compensated Input Commands
• Controlled Acceleration Mode
• Internal Redundant Brake and Low-Speed Disable
• Braking Disable
Description
The CA3228 is a monolithic integrated circuit designed as an
automotive speed-control system.
The system monitors vehicle speed and compares it to a
stored reference speed. Any deviation in vehicle speed
causes a servo mechanism to open or close the engine
throttle as required to eliminate the speed error. The refer-
ence speed, set by the driver, is stored in a 9-bit counter.
The reference speed can be altered by the ACCEL and
COAST driver commands. The ACCEL command causes
the vehicle to accelerate at a controlled rate; the COAST
command disables the servo, thereby forcing the vehicle to
slowdown. Application of the brake disables the servo and
places the system in the standby mode while the RESUME
command returns the vehicle to the last stored speed.
Vehicle speed and driver commands are inputs to the
integrated circuit via external sensors. Actuators are needed
to convert the output signals into the mechanical action
necessary to control vehicle speed.
The CA3228 is supplied in a 24 lead dual-in-line plastic
package (E suffix). Refer to AN7326 for application
information.
Applications
• Automotive Speed Control
• Residential and Industrial Heating and Cooling
Controls
• Industrial AC and DC Motor Speed Control
• Applications Requiring Acceleration and Deceleration
Control
Pinout
CA3228 (PDIP)
TOP VIEW
Ordering Information
PART
NUMBER
CA3228E
GND
NC
1
2
3
4
5
6
7
8
9
24 GND
23 OUTPUT GATE
22 VACUUM CONTROL
21 VENT CONTROL
20 CONTROL AMP+
19 CONTROL AMP OUTPUT
18 CONTROL AMP-
17 ALIGN
16 V ERROR
15 ACCELERATE CAPACITOR
14 ACCELERATE RESISTOR
13 V
CC
TEMPERATURE
-40
o
C to +85
o
C
PACKAGE
24 Lead Plastic DIP
DRIVER COMMAND
COMMAND DELAY
OSCILLATOR
V MEMORY
CURRENT SENSE SPEED
SENSOR INPUT
F/V OUT
F/V FILTER 10
V
S
11
BRAKE INPUT 12
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
©
Harris Corporation 1999
File Number
1436.3
10-31
Specifications CA3228
Absolute Maximum Ratings
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9.0V
Supply Current, I
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Driver Command Input (I
CMD
), Pin 3 . . . . . . . . . . . . . . . . . . . . 2mA
Brake Input (I
BRAKE
), Pin 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Storage Temperature Range . . . . . . . . . . . . . . . . -65
o
C to +150
o
C
Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . +150
o
C
Thermal Information
Thermal Resistance
θ
JA
Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
o
C/W
Power Dissipation Per Package
For T
A
= -40
o
C to +70
o
C . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2mW
For T
A
Above +70
o
C . . . . . . . . . . . Derate Linearly at 15.4mW/
o
C
Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . +265
o
C
Operating Temperature Range . . . . . . . . . . . . . . . . -40
o
C to +85
o
C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Typical Switching Characteristics
Driver Command Input Hold Times (Based on 0.68µF on Pin 4):
ACCEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
COAST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
RESUME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330ms
ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
Internal Oscillator Frequency, F
OSC
. . . . . . . . . . . . . . . . . . . 10kHz
(Based on 0.001µF at Pin 5)
System Performance
F
OSC
= 50kHz, f
S
/Speed Ratio = 2.22Hz/mph
Speed Sensor Input Frequency Range, f
S
at Pin 8 . .62Hz to 222Hz
Speed Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45 mph
Minimum Operating Speed. . . . . . . . . . . . . . . . . . . . . . . . . . 25 mph
Maximum Stored Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mph
Redundant Brake Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 mph
Electrical Specifications
PARAMETERS
Operating Voltage
T
A
= +25
o
C, V
CC
= 8.20V, Unless Otherwise Specified (Refer to Figures 2 and 3)
SYMBOLS
V
CC
TEST PIN
13
T.P.B.
I
CC
V
7
V
17
V
3IDLE
13
7
17
3
43kΩ to Ground
41kΩ to Ground
S1, S2, S3, S4, S5
Open
S2 Closed
S3 Closed
S4 Closed
S5 Closed
S1 Closed
S6 Closed
62Hz
≤
f
S
≤
222Hz
TEST CONDITIONS
MIN
7.40
3.50
7.50
4.85
4.00
7.6
MAX
9.00
15.0
30.0
5.95
4.20
7.9
UNITS
V
Vpp
mA
V
V
V
Speed Sensor Input Voltage Amplitude
V
CC
Supply Current
Current Sense Voltage
Align Voltage
Command Idle Voltage
RESUME Command Voltage
ACCEL Command Voltage
COAST Command Voltage
OFF Voltage
ON Voltage
Brake Input Voltage
OUTPUT VOTLAGE
Gate
V
3RES
V
3ACCEL
V
3COAST
V
3OFF
V
3ON
V
BRAKE
3
3
3
3
T.P.A.
12
5.95
3.95
1.22
0
9.2
5.4
6.56
4.91
2.23
0.77
28
28
V
V
V
V
V
V
V
OL
V
OH
23
4.7kΩ to V
CC
-
8
300
-
400
-
400
-
mV
V
mV
V
mV
V
VAC
V
OL
V
OH
22
1.2kΩ to V
CC
-
8
VENT
V
OL
V
OH
21
1.2kΩ to V
CC
-
8
10-32
Specifications CA3228
Electrical Specifications
PARAMETERS
Memory Set Error
Deadband Range (VAC and VENT Outputs
Off)
Control Amplifier Gain
D/A Voltage Range
T
A
= +25
o
C, V
CC
= 8.20V, Unless Otherwise Specified (Refer to Figures 2 and 3)
(Continued)
SYMBOLS
V
6
- V
10
V
DB
TEST PIN
6, 10
21, 22
Sweep Pin 19,
Voltage at 1V/sec
A
CNTL
= V19/V16
Set Mode
TEST CONDITIONS
MIN
-77
0.96
MAX
67
1.43
UNITS
mV
V
A
CNTL
V
M
16, 19
6
74
6
-
7.50
Ratio
V
Functional Block Diagram
1 GROUND 24
V
CC
3
V
CC
RESUME
DRIVER COMMAND
COMMAND DELAY
3
4
COMMAND
DECODER
AND
DELAY
ACCEL
COAST
ON
OFF TOGL
I
2
L
CONTROL
LOGIC
GATE
OUTPUT
23 GATE
21 VENT
CONTROL
VACUUM
22 CONTROL
19
CONTROL AMP.
OUTPUT
VENT
VAC
OSCILLATOR
5
OSC.
OVER SPEED
DETECTOR
RESUME
DETECTOR
+
BRAKE INPUT 12
BRAKE
SENSOR
20 CONTROL AMP. (+)
CONTROL AMP.
_
ERROR AMP.
18 CONTROL AMP. (-)
16
0.45V
“E”
ACCEL.
RATE AMP
14 ACCELERATE
RESISTOR
V ERROR
SPEED
SENSOR INPUT
F/V OUT
8
9
F/V
CONVERTER
V
S
MINIMUM
SPEED
SENSOR
REDUNDANT
BRAKE
F/V FILTER 10
V
S
ANALOG TO
DIGITAL TO
ANALOG
CONVERTER
V
M
“C”
“B” MODE
SW
“D”
“A”
V
S
11
15 ACCELERATE
CAPACITOR
V MEMORY
CURRENT
SENSE
6
V
M
ALIGN
17 ALIGN
7
CURRENT
SENSE
10-33
CA3228
START
ERASE
MEMORY
YES
NO
BRAKE?
NO
OFF
> 40 ms?
NO
IGNITION
OFF?
YES
NO
ON
> 40 ms?
YES
STANDBY
NO
COAST?
YES
NO
> 25MPH?
YES
INPUT
> 40ms?
> 25MPH?
YES
INPUT
> 40ms?
YES
ACCEL?
YES
NO
RESUME?
YES
ACCEL
> 4 ms?
YES
COAST
> 40ms?
YES
NO
NO
NO
NO
> 2 MPH?
RELAX
SERVO
ACCEL AT
CONTROLLED
RATE
RELAX
SERVO
> 25MPH?
YES
> 25MPH
STORED?
STILL
COAST?
NO
ENABLE
SERVO
ENABLE
SERVO
DISABLE
RESUME MODE
YES
YES
STILL
ACCEL?
NO
YES
2
INPUT
> 245ms?
YES
NO
NO
YES
STORE
PRESENT
SPEED
SPEED
= STORE?
NO
NO
CRUISE
SPEED
< STORE?
YES
YES
COAST
>40ms?
NO
YES
RELAX
SERVO
ACCEL AT
CONTROLLED
RATE
1
ACCEL
> 40ms?
NO
NO
YES
DISABLE
RESUME MODE
YES
ACCEL
> 40ms?
NO
YES
IGNITION
OFF?
> 25MPH?
NO
YES
Redundant
BRAKE?
NO
NO
2
1
DISABLE
RESUME MODE
YES
COAST
> 40ms?
NO
DISABLE
RESUME MODE
YES
BRAKE?
NO
YES
YES
CLUTCH
DISABLE?
NO
YES
OFF
> 40ms?
BRAKE
NO
NO
CLUTCH
DISABLE?
YES
10-34
CA3228
V
3
ON
ON
R3, 2.2K
RESUME
R4,680
SET/ACCEL
R5, 120
COAST
OFF
MOMENTARY
CONTACT
DRIVER
COMMAND
SWITCHES
S1
S2
S3
V
CC
T.P.A.
RI
560
R2
10K
0.001µF
8.2K
10K
0.68µF
1
0.1µF
2
3
CA3228E
4
5
6
7
43K
0.047µF
8
9
10
150K
11
12
51K
BRAKE LIGHT
BRAKE SWITCH
S6
SWITCH
FUNCTION
S1 - ON
S2 - RESUME
24
23
22
21
20
19
18
17
16
15
14
13
2.4M
R
EXT
V
CC
VOLTAGE AT TERM. 3
RATIO TO V
CC
MIN
1.12
0.725
0.482
0.148
0
0.93
MAX
-
0.8
0.599
0.272
0.094
0.96
10K
C
EXT
2.2µF
+
10K
1M
GATE
VAC
VENT
V
CC
10K
SEE FIGURE 3
S4
S5
0.05µF
N
T.P.B.
S
SPEED INPUT
FREQUENCY, f
S
2.22 Hz/MPH
2.2µF
10K
ALL RESISTANCE VALUES ARE IN OHMS
V
BRAKE
S3 - ACCEL
S4 - COAST
S5 - OFF
IDLE (Note 1)
NOTE: 1. All Switches Open
FIGURE 2. TYPICAL AUTOMOTIVE SPEED CONTROL APPLICATION
0.22µF
+8.2V
VOLT.
REG
+14.4V
1.2K
V
CC
VAC
1.2K
VENT
SOLENOID
VENT
CA3228E
(SEE FIGURE 2)
4.7K
GATE
620
0.5W
VACUUM
SOLENOID
TO
AIR
N.O.
VENT
VALVE
N.C.
VAC
VALVE
TO VACUUM
SOURCE
DIAPHRAGM
SYSTEM MODE
VALVE
POSITON
FEED BACK
(OPTIONAL
TO PIN 20)
ACCEL
Open
Close
CRUISE
NC (Note 1)
Close (Note 1)
COAST
NC
NC
VAC
VENT
NOTE:
1. Open or Closed as Required to Maintain Set Speed Error
TO THROTTLE
ACCEL
VAC (Pin 22)
VENT (Pin 21)
GATE (pin 23)
H
H
L
CRUISE
L
H
L
COAST
L
L
L
BRAKE
L
L
H
REDUNDANT BRAKE
L
L
H
HI-SPEED DROPOUT
L
L
H
LO-SPEED DROPOUT
L
L
H
FIGURE 3. SOLENOID DRIVERS AND SERVO VACUUM CONTROL MECHANISM TYPICAL APPLICATION
10-35
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